These, kind of ships carry containers. These ships classifeid with their TEU capacity. TEU means "twenty foot equvileant unit" in technical term. As normally called " container"
Cargo ships are displacement vessels. When you put a displacement boat in the water, it sinks until the weight of the boat exactly equals the weight of the water that it displaces. They stay above...
The bridge aka pilot house, wheel house is where the ship is driven or piloted from. There you will usually find the ship's wheel and the other controls needed to navigate the ship.